Brake



Sept. 21, 1937. I E. LA BRIE 2,093,638 BRAKE Filed Aug.. 12, 1955 '4sheets-sheet 1 IN VEN TOR.

' l A TTORNEY INVENToR.

m/UX ATTORNEY 4 Sheets-Sheet 2 L. E. LABRlE BRAKE Filed Aug. '12, 1955Sept. Z1, 1937.

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Sept. Z1, 1937. i L. E. LA BRIE I v 2,093,638

' v lBRAKE FiledvAug. 12, 1955 4 sheets-sheet 4 INVENTOR.

. ATTORNEY Patented Sept. ,21, 1937 UNITED STATES PATENT oFElcE BnAKELudger E. La Brie, Sout h Bend, Ind., assignor to Bendix ProductsCorporation, South Bend, Ind., a corporation of Indiana ApplicationAugust 12, 1935, serial No. 35,7290 12 claims. l(o1. iss-14o) 15 derivedtorque into a useful force. Another object of the invention is toprovide in amechanicalpower brakeof the type described -fjnovel meansfor resolving torque which may be in either direction to a useful forceacting in one zol direction.

A further object of the inventionnrelatesrtoVV the employment of chainsnd sprockets to ac- COmplIShthe/'hereinoove set forth object.

Thezabove and other objects and novel features g of the .invention willappear more fully herein- I2 projecting therefrom. In the particulararrangement shown, an overrunning free wheel clutch I4 is illustratedwith a lock-out device I6 although the same may be dispensed with. To'

the rear of the freewheeling unit is splined'a 45 second drive shaft I8which traverses the casing 20 secured to the transmission casing I8.

Splined to theshaft I8 is a spider 22 carrying an annular friction disc24 axially movable with respect tofthe spider. On a hollow stationarystub shaft or support26 which is integral with the casing and throughwhich the driveshaft llpasses,` is provided a pair of relativelystationary friction discs 28 and 3U which are pinned together at 32 toprevent relative rotation and provided with springs 15 sleeve 38secured'to one of the discs28 *meshes with a pair ofsector gears '40'and 42 each mounted upon a separate'stub shaft 44 and 46. 20 Alsocarried on the Vstub shafts 44 and 46 are a pair ofsprockets 48 and 50,each lying in the same plane and adapted to engage a chain 52- whichpasses over sprocket V5I] and under sprocketfils. 'I'heiree end 54 ofthe chain adjacentsprocket 25 after from the :foilowingdetailed-descripti41-48fis secured to a clevis 56 which in turn issewhen taken in conjunction withthe accompany" ing drawings. It isexpressly understood, hown the drawings wherein like reference nuimerals indicate likefparts: f

Figure 1 isa longitudnalsection taken through I the power brakemechanism showing the details thereof;

Figure 2 is a transverse section taken through Figure 1 approximately onthe line 2 2;

Figure 3 is a section taken on the line 3-3 of Figure 2; v y

Figure 4 is a transverse section taken on the line 4 4 of Figure 1;

Figure 5 is an end view of a modified form of mechanical power deviceshown partly in section; Figure 6 is a longitudinal section of the formof Figure 5; l i Figure 7 is a further modied form of the inventionshowing a longitudinal section thereof; Figure 8 is a transverse sectionof Figure 7 taken on the line 8-8. Referring more particularly toFigures 1 to 4 inclusive, and Figure l'particularly, there is shown atransmission gear casing III having'a drive shaft cured to a tensioncable 58 adapted to operate -a vehicle wheel brake linkage.. The otherend of the chainY after passing over sprocket is provided with aU-shaped fitting 5'9'which is con- YV,im nected to a spring 60 whichmaintains the chain under tension. Interengaging axially extending lugs.62 and 64011 sector gear 40 and sprocket 48 are adapted to transmitcounterclockwise rotation of sector gear Alito sprocket 48 and to per-35 mit relative rotation between the sector gear-48 and lthesprocket 4Lwhen the former is rotated `\clockwise-. Similarly interengag-ingVaxially extending ugs`66nand 68 0nv sector gear42cand v .sprocket 58 areadapted to transmit clockwiselo rotation of sector gear 42 to sprocket.58, and to permit relative rotation between the sector gear 42 andsprocket 50 whenever the former rotates counterclockwise. Thusregardless of the direction of rotation of the friction discs, the chain45.

k52 vwill always move-"in the same 'direction to tension the cable 58'.l

` In order to apply the friction discs 28 and 30 -into engagement withthe spider carried disc 24,

a pair of relatively rotatable levers 10 and 'I2 are 60 rockably mountedon thehollow stub shaft 26. Each of the levers has conical recesses 14and 16 in their adjacent faces with spherical ballsA l5 jointly retainedin the recesses, so that: relative rotation between the levers resultsin axial 2 aoeaese spreading. Thrust bearings 10, 80 and collar 02 toengage lugs carried by collars M6 and |44, transmit the axial 'spreadingaction-to the fricwhereby rotation of either sprocket |38 clocktiondiscs 28 and 30 to cause frictional engagewise will rotate shaft |40clockwise, and whereby ment with disc 24. The collar 82 also is of suchrotation of either sprocket counterclockwise is diameter as -to form aguide for the chain jon permitted free of theshaft |40. In order to 5sprocket 48 and tends to prevent the same from maintain the chainreasonably taut spiral springs jumping therefrom. |50 and |52 may beprovided to tend to rotate The lever is connected to a control cable 84both sprockets in a counterclockwise direction. which may be operated bya brake pedal. The Also to compensate for the-right angle between 10lever 12 is provided with a roller 86 adapted to the axes of thesprockets |38 and |36 and |32, the 10 engage a cam 88 pinned to the stubshaft 44 chain is provided with angle pieces |54 and |56. l which shaftis keyed to the sector gear 40. The 'I'he shaft |40 is provided with asuitable crank cam is preferably of the double variety so as to or lever|60 which may be connected to a suitable permit clockwise rotation oflever 12 as the brake vehicle wheel brake system. is applied, thusgiving a follow up in the control The modified form of Figures .5 and 6illus- 15 cable 84 as tothe extent of brake application. trated inFigures 'I and 8 differs only in the As may be seen, the cam 88 is soformed that manner of deriving a torque from the friction its high pointcontacts with the roller 86, when disc driven gear |25 which is carriedon the holthe roller is in its normal position, as shown. low shaft |03.In this form, the casing is pro- Rotation of theshaft 44 allows theroller to ride vided with a pair of stub shafts |80 and E82 each 20 downfrom the high point of the cam and alcarrying a sector gear |84 and i86adapted to lows the lever 12 to rotate in a clockwise direction. meshwith the gear |25. Adjacent each sector This rotation of the lever 12 inthe clockgear on their respective studs are provided 45 wise directionis therefore in the sarne direction spiral gears |88 and |90, eachadapted to engage as the rotation of the lever 10 to apply the brakes, acorresponding spiral gear |89 and ISI arranged 25 and thus relieves to acertain extent the applyon a single transverse shaft |92. A pin and sloting action caused by the relative movement of connection |84 betweensector gear |84 and spiral the levers cooperating with the action of thegear |88 causes rotation of the'latter uponV clockspherical balls in theconical recesses 14 and 16. wise rotation of the former. Similarly a pinand Thus it is necessary for the operator to continue slot connection|96 between sector gear |86 and 30 applying movement to the pedal inorder to conspiral gear |90 causes rotation of the latter upon tinue theapplication of the brakes. In View of counterclockwise -rotation of theformer. The the relatively small radius of the cam 88 and its spiralgear |88 and |90 however, are free'to overrelatively small departurefrom concentricity, the run their adjacent sector gears |84 and |86, andfollow-up movement of the pedal is small, relathe arrangement is suchthat rotation of the 35 tive to the movement of the cable 58 in applyingfriction discs |06 and |08 in either direction the brakes.i will causerotation ofthe shaft |92 in the same A modified form illustrating theinvention is direction, and this shaft may be provided with a shown inFigures 5 and 6 wherein the transmiscrank arm 200 for operating avehicle wheel brake 40 sion casing` |00 having a drive shaft |02extendsystem.

ing from the rear thereof is provided with a OperationV Gfalltheabovemodifications is such n housing |04 for enclosing the mechanical poweras to produce a unidirectional AVbrake applying the device to produceengagement thereof regardless housing |04 and on which are mountedrelativelye-`OLthegdlrection of rotation of the friction device. 45

s stationary friction discs |06 and |08 which are Although severalembodiments of the invenadapted to engage the rotating annular disc ||0tion are illustrated, it is to be understood that carried by the rotaryshaft driven spider ||2. the inventionv is not limited thereto but maybe The di l. :u I: re-Slidably/pinnedtoembodied in maryrvarie/me 9Ngether as at H3 and provided with release ments. For exainp e sustitutions of the various 50 springs ||4 arranged in opposed sockets inthe elements of one combination or modification may discs. Frictionalengagement of the discs is ac- .bernadefprnthe corresponding elements ofancomplished by a lever ||6 'rotatably mounted on other. As such andmany other chan es may be the hollow/shaft |03 and provided with conicalmade in the construction an rangement of Y riff/'s/ze/S/Ses ||8 adaptedto engage spherical studs parts without mg from the spirit of the 55 v nas wil |20 carried by the casing side WallJhQbYJ/ l be apparent to thoseskilled in tation of the levercauses-axialmovement therethe art,referenceill/befhad to the appended of. The axial movement istransmitted to'thefclaim's'for a definition of the limits of the in-J/.ffriction discs 4through a thr bearing |22 and vention.

a sleeve |24 integral with the disc |06. Thrust What is claimed is: fb/reaction is taken care of by a thrust bearing |26 I. In a mechanicalpower/brak a w eel driven located on the other side of the friction disc|08. drive shaft, means for frictionally deriving torque The lever ||6,may b e operated by a cable passing therefrom including a pinion andmeans asout of the casing as is illustrated in Figures 1 sociated withsaid torque deriving means into 4.A v cluding a pair of sector gears, asprocket driven 65 The sleeve |24 is provided with a gear |25 by each ofsaid gears'and a chain wrapped on adapted to mesh with a gear |28mounted on a said pair of sprockets for actuating wheel brakes stubshaft |30 below the main shaft. The gear regardless of the direction of.rotation of said |28 drives a sprocket 132 having a chain |34 driveshaft. 7o therearound, the ends of which extend upwardly 2. In amechanical power brake, a wheel driven 70 in the casing and around apair of .'sprockets drive shaft, a friction disc driven thereby, con-|36 and |38 on a transverse shaft |40 to which centric friction discsforengagement with said sprockets the ends of the chain are aflixed. J Thefriction disc,A means for engaging said discs in sprockets |38 and |36are provided'with axial varyingdegree, a pinion driven by said friction15 extending lugs |42 and |40 which are adapted discs, a pair of pinionsin mesh with said driven 75 take-off. Surr unding the shaft |02 is aystavforce in response to actuation of the friction r/ tionary hollowstu sasecur 15 lone' direction and the other pinion in the other anddriven by said member when the shaft is 2,093,638 3 pinion mounted oneccentric stub shafts and concentric friction disc, asprocket havingracnemeans for employing the rotation of one pinion way clutch to one ofsaid members and driven by when in one direction and the other pinion insaid member when the discs are rotating in one vthe'other direction forapplying vehicle wheel direction, a sprocket having a oneway clutchbrakes regardless of the rotation direction of said tol-the other ofsaidjmembers and driven by said friction discs. other of said memberswhen the discs are rotat- 3. In a mechanical power brake, a wheel driven'ing in the opposite direction, and means comdrive shaft, a frictiondisc driven thereby, conprising a chain passing over one sprocket andcentric friction discs Vfor engagement with said under the other forconnecting said sprockets '10 friction disc, means for engaging saiddiscs in to the vehicle braking system. i

varying degree, a pinion driven by said friction 9.`A mechanical powerbrake for automotive discs, a pair of pinions in mesh with said drivenvehicles comprising a drive shaft, a pair'of mempinion mounted oneccentric stub shafts, means bers arranged to be driven thereby, asprocket r for employing the rotation of one pinion when in having aone'-way clutch to one of said members direction for applying vehiclewheel brakes rerotating in onedirection asprocket havingaonegardless ofthe rotation direction of said friction way clutch to the other of saidmembers and discs, 4and means for modifying said engaging driven bysaidother of said members when the means in accordance with the rotation ofone of shaft' is rotating in the opposite direction, and said pinions. imeans comprising a chain passing over one 20 4- A mechanical DOWer brakefor automotive sprocket and under the-other for connecting said VehiclesCQmPI'iSng awheel driven drive shaft, a sprockets to the vehicle brakingsystem. friction disc driven thereby, concentric friction 10. In amechanical power brake; a wheel discs for engagement with said frictiondisc, drivenvdrive shaft; a friction disc driven theremeans for engagingsaid discs in varying degree, by; a concentric friction disc forengagement 25 a gear driven by said friction discs, a pair of pinwithsaid first-named friction disc; means comions driven by said gear, andmeans comprising prising an applying lever and a releasing lever, y acliain driven by one of'said pinions when roeach having a recess, ballsretained in said recess,

tating in one direction, and driven by the other and means for rotatingsaidj applying lever for v of said pinions when ro-tating in anotherdireccausing the engagement of said friction discs; 30

tion. y a pinion driven by said concentric friction disc; 5. Amechanical power brake for automotive a pair of toothed members, each inmesh with vehicles comprising a wheel driven drive shaft, a said drivenpinion and both mounted on eccenfriction disc driven thereby, concentricfriction tric stub shafts; means for using the rotation of discs forengagement with said friction disc, one toothed members when driven inone direc- 35 means for engaging said discsin varying degree. tion andthe other toothed member when driven a pair of members driven by saidconcentric fricin the other direction for applying vehicle brake tiondiscs, and means driven by one of said memwheels, regardless of thedirection of rotation of bers when the discs are rotating in onedirection, said friction discs; and means for modifying said f 40 meansdriven by the other of said members wheningaging means in accordancewith the rotation'no/ the discs rotate inthe opposite;direetior-i,fanlof one of said toothed members, said lastlnamed means for connecting/bothvfof said last named means comprising a shaft secured to one of saidwr"--meanstoavehicleibraking system. s toothed members and rotatedthereby. a cam se- 6; A mechanical p owerbrake for automotive cured tosaid shaft, a roller secured to said r,eg-e-Vir vehicles comprising awheel driven drive shaft, leasing lever and contactingsaid/camf 45 afriction disc driven thereb a concentric fric-Wf-1f1nwa-mecfmnal powerI'Jrake; a wheel I tion disc for engagement with said first-'nameddriven drive shaft; a friction disc driven therefrictiondisc, means forcausing the engagement by; a concentric friction disc for engagement ofsaid discs, a gear driven by said concentric Kwithsaid first-namedfriction disc; means comrection. W mem 7. A mechanical ower vbrake forautomotive and both mounted on eccentric stub shafts; vehiclescomprising a wheel driven drive shaft, means for using the rotation ofone toothed a friction disc'driven therebygaconcentric fricmember whendriven in one'directionand the so tion disc for engagement withsaid`st=named--other. toothed member when driven in the other 60friction disc, means for causing the engagement direction for applyingvehicle brake wheels, Vre of said discs, `a gear driven by saidconcentric gardless ofthe direction of rotation of said fric-r ifriction" disc, a pair of 'pinions driven said tiondiscscbmprisingnagpair of sprockets, each i sfeer,l a pair of sprockets,one driven byfzeach vof connected to one`of said "toothedY members by, aB5 said pinions, a chain driven by one of said .one-way Clutch, a chainpassing over one of said 65 f sprocketswhen-thadiscs are rotating in onedisprockets and under the other, and a spring sereetion and driven bythe-'othereofgsaid sprockets cured to said` chain; and means formodifying when the discs are rotating in theotherrdirection, saidengaging means in accordance with the roand a spring connected to oneend .of said chain. tation of one of said toothed members, saidlastfriction `disc driven thereb aoncentric fric`V a. cam secured toysaid shaft; a -ro`ller secured to tiondisc, for engagement with saidfirst-named saidmeleasing lever and contacting said "'cam.'A

torque therefrom and means associated with said torque deriving meansincluding a pair of movable members, one adapted to be moved by rotationof said deriving means in one direction, and the other adapted to bemoved by rotation of said deriving means in the other direction, andtension means connected to both of said moving aceaoee means to transmita brake applying force from movement of one member or movement of theother, said tension means causing simultaneous movement of both membersinthe same direction that they would be individuallymoved by saidderiving means and associated means.

\ LUDGER E. LA BRIE.

